Malicious PDF — malware analysis report

Static analysis result for SHA-256 3656c73ccd1d00a4…

MALICIOUS

PDF

33.2 KB Created: 2021-07-22 11:15:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a50d5061b4ce4c56c1606a46299bd022 SHA-1: 444bb4d9514d346ffde27b152d96e85e324b66d5 SHA-256: 3656c73ccd1d00a4c19f0c237571e49e9185eb890b6f4a0726c09b57923c268b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. The primary URL, http://netcdn.tw/app/835599320/how-to-get-free-tiktok-fans-game-hack, indicates a lure for free in-game items or followers, a common social engineering tactic. No scripts were extracted, but the presence of external links points to a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/835599320/how-to-get-free-tiktok-fans-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6E 23136 bytes
SHA-256: 5220229c14ec1c3f5802c170448bd5f3bc251abf2df7f987e3a9347f0e1e5223
font_01_sfnt_off00006125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6125 17848 bytes
SHA-256: a2af0e2105c7a8aa19b9291fb3a0139b13b39cb6820be81d8c7aa710ed8fb109

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